This is a magnificent art glass vase from Plus Glass in Norway.  This design has been attributed to Richard Duborgh.  The acid etched mark on the base is only the PLUS Glass mark and logo.  This is done in a beautiful olive green and it stands approx. 10 inches tall.  The bottom portion of this vase is square and this part measures 3 inches by 3 inches.  The upper portion is round and measures 4 inches in diameter.  This is a lovely piece with no scuffs, cracks or chips.  Ship to US only by USPS.  International ship by Ebay International.